There's an article by Peter Samelson in the March 2015 issue of MAGIC magazine.

I quote:

The Magic of Levinson & LinkBy Peter SamelsonArguably the most successful writing duo in television, Richard Levinson & William Link also penned stories for books, films, and theater. The men responsible for magic-themed shows like Doug Henning's Merlin on Broadway and Blacke's Magic on TV had an amazing career that stemmed largely from their own interests in conjuring.